I remember some multiplayer FPS game that I tried about 10 years ago - set in the '40's (US versus Germany - it wasn't BF1942 - not that I remember exactly - my first BF game was BF2). My son found a "hack" (was free), that once it was applied, showed shadows of players in two colors (friend/enemy) all over the map (thru walls, etc). So you knew if someone was probably around the corner - but maybe on the other side of a wall (something like that) - so it wasn't guaranteed to turn a corner and shoot - it may be a wall there!

But...it was easy to see who was doing that, however - if I recall, if you died (or something or were waiting to spawn in) - you could change view to anyone else on the map and see what they saw - including the colored shadows and would know they were cheating.

Yes, it was interesting...but after you cycle'd thru everyone's screen (you learned to do that really quick) - you could know who was cheating and who wasn't (I'm sure there were other hacks - that was the only one I knew of/tried).

Yes, it was interesting...but really did detract from the game (and yes, I died a lot - those kids are just way to dang fast!)